/* ==================== 变量定义 ==================== */
:root {
    --mc-dark: #1A1A1A;
    --mc-darker: #0F0F0F;
    --mc-gray: #AAAAAA;
    --mc-white: #FFFFFF;
    --mc-gold: #FFAA00;
    --mc-green: #55FF55;
    --mc-dark-green: #00AA00;
    --mc-aqua: #55FFFF;
    --mc-red: #FF5555;
    --mc-dark-red: #AA0000;
    --font-pixel: 'VT323', monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-pixel);
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f0f23 100%);
    min-height: 100vh;
    color: var(--mc-white);
    overflow-x: hidden;
}

/* ==================== 背景粒子 ==================== */
.background-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    animation: float 15s infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}

/* ==================== QQ群按钮 ==================== */
.qq-group-btn {
    position: fixed;
    top: 15px;
    right: 15px;
    z-index: 1000;
    background: linear-gradient(180deg, #12B7F5 0%, #0A8CD0 100%);
    border: 3px solid #086B9E;
    color: white;
    padding: 8px 16px;
    font-family: var(--font-pixel);
    font-size: 16px;
    text-decoration: none;
    text-shadow: 1px 1px 0 #000;
    box-shadow: 
        inset 1px 1px 0 rgba(255,255,255,0.3),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        3px 3px 0 rgba(0,0,0,0.3);
    transition: all 0.2s;
}

.qq-group-btn:hover {
    background: linear-gradient(180deg, #2BC4F7 0%, #12B7F5 100%);
    transform: translateY(-2px);
}

/* ==================== 头部 ==================== */
.header {
    text-align: center;
    padding: 30px 20px 20px;
    position: relative;
    z-index: 1;
}

.back-link {
    position: absolute;
    top: 20px;
    left: 20px;
    color: var(--mc-aqua);
    text-decoration: none;
    font-size: 16px;
    text-shadow: 1px 1px 0 #000;
}

.back-link:hover {
    color: var(--mc-white);
}

.header-content {
    margin-top: 10px;
}

.logo-text {
    font-size: 42px;
    font-weight: normal;
    color: var(--mc-gold);
    text-shadow: 3px 3px 0 #000;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 18px;
    color: var(--mc-aqua);
    text-shadow: 2px 2px 0 #000;
    margin-top: 5px;
}

.sponsor-text {
    font-size: 14px;
    color: var(--mc-gray);
    text-shadow: 1px 1px 0 #000;
    margin-top: 10px;
}

.sponsor-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--mc-gold);
    text-decoration: none;
    padding: 3px 8px;
    border: 2px solid #333;
    background: rgba(0,0,0,0.3);
    transition: all 0.2s;
    margin-left: 5px;
}

.sponsor-link:hover {
    color: var(--mc-white);
    background: rgba(0,0,0,0.5);
    border-color: var(--mc-gold);
}

.sponsor-icon {
    height: 16px;
    width: auto;
    vertical-align: middle;
}

/* ==================== 主内容 ==================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* ==================== 转换选项 ==================== */
.convert-options {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
    padding: 20px;
    background: rgba(0,0,0,0.3);
    border: 3px solid #333;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.option-group label {
    font-size: 14px;
    color: var(--mc-gray);
}

.format-select {
    padding: 10px 20px;
    background: #1A1A1A;
    border: 3px solid #444;
    color: var(--mc-white);
    font-family: var(--font-pixel);
    font-size: 18px;
    min-width: 200px;
    cursor: pointer;
}

.format-select:focus {
    outline: none;
    border-color: var(--mc-aqua);
}

.swap-btn {
    width: 50px;
    height: 50px;
    background: #333;
    border: 3px solid #444;
    color: var(--mc-aqua);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s;
}

.swap-btn:hover {
    background: #444;
    color: var(--mc-white);
    transform: rotate(180deg);
}

/* ==================== 编辑器区域 ==================== */
.editor-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 15px;
    margin-bottom: 30px;
}

.editor-panel {
    background: linear-gradient(180deg, #2D2D2D 0%, #1A1A1A 100%);
    border: 4px solid #1A1A1A;
    display: flex;
    flex-direction: column;
    box-shadow: 
        inset 2px 2px 0 #444,
        inset -2px -2px 0 #000,
        4px 4px 0 rgba(0,0,0,0.5);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    background: #1A1A1A;
    border-bottom: 2px solid #333;
}

.panel-header h3 {
    font-size: 18px;
    color: var(--mc-gold);
    text-shadow: 1px 1px 0 #000;
}

.panel-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 5px 12px;
    background: #333;
    border: 2px solid #444;
    color: var(--mc-gray);
    font-family: var(--font-pixel);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.action-btn:hover {
    background: #444;
    color: var(--mc-white);
}

.code-editor {
    flex: 1;
    min-height: 400px;
    padding: 15px;
    background: #0F0F0F;
    border: none;
    color: var(--mc-green);
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
}

.code-editor:focus {
    outline: none;
}

.code-editor::placeholder {
    color: #555;
}

.code-editor[readonly] {
    background: #0A0A0A;
    color: var(--mc-aqua);
}

/* ==================== 转换按钮 ==================== */
.convert-action {
    display: flex;
    align-items: center;
}

.convert-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 20px 30px;
    background: linear-gradient(180deg, var(--mc-green) 0%, var(--mc-dark-green) 100%);
    border: 4px solid var(--mc-dark-green);
    color: var(--mc-white);
    font-family: var(--font-pixel);
    font-size: 18px;
    text-shadow: 1px 1px 0 #000;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 
        inset 2px 2px 0 #8FC,
        inset -2px -2px 0 #2A4A1A,
        4px 4px 0 rgba(0,0,0,0.5);
}

.convert-btn:hover {
    background: linear-gradient(180deg, #7CDD6B 0%, var(--mc-green) 100%);
    transform: translateY(-2px);
}

.convert-icon {
    font-size: 32px;
}

/* ==================== 使用说明 ==================== */
.help-section {
    background: rgba(0,0,0,0.3);
    border: 3px solid #333;
    padding: 20px;
}

.help-section h3 {
    font-size: 20px;
    color: var(--mc-gold);
    text-shadow: 2px 2px 0 #000;
    margin-bottom: 15px;
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.help-card {
    background: #1A1A1A;
    border: 2px solid #333;
    padding: 15px;
}

.help-card h4 {
    font-size: 16px;
    color: var(--mc-aqua);
    margin-bottom: 8px;
}

.help-card p {
    font-size: 14px;
    color: var(--mc-gray);
    line-height: 1.4;
}

.help-tips {
    background: #1A1A1A;
    border: 2px solid #333;
    padding: 15px;
}

.help-tips p {
    font-size: 16px;
    color: var(--mc-yellow);
    margin-bottom: 10px;
}

.help-tips ul {
    list-style: none;
    font-size: 14px;
    color: var(--mc-gray);
}

.help-tips li {
    margin: 5px 0;
    padding-left: 20px;
    position: relative;
}

.help-tips li::before {
    content: '•';
    position: absolute;
    left: 5px;
    color: var(--mc-aqua);
}

/* ==================== 页脚 ==================== */
.footer {
    text-align: center;
    padding: 20px;
    margin-top: 30px;
    border-top: 2px solid #333;
    position: relative;
    z-index: 1;
}

.footer p {
    color: var(--mc-gray);
    font-size: 14px;
    margin-bottom: 10px;
}

.footer a {
    color: var(--mc-aqua);
    text-decoration: none;
}

.footer a:hover {
    color: var(--mc-white);
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 10px;
}

.footer-links a {
    color: var(--mc-aqua);
    text-decoration: none;
    font-size: 14px;
}

.footer-links a:hover {
    color: var(--mc-white);
}

.bilibili-icon {
    width: 18px;
    height: 18px;
    vertical-align: middle;
}

/* ==================== 弹窗 ==================== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: linear-gradient(180deg, #3D3D3D 0%, #1A1A1A 100%);
    border: 4px solid #1A1A1A;
    padding: 25px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: 
        inset 2px 2px 0 #555,
        inset -2px -2px 0 #000,
        8px 8px 0 rgba(0,0,0,0.5);
    animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    color: var(--mc-gray);
    font-size: 28px;
    cursor: pointer;
}

.modal-close:hover {
    color: var(--mc-red);
}

.modal-content h3 {
    font-size: 22px;
    font-weight: normal;
    color: var(--mc-gold);
    text-shadow: 2px 2px 0 #000;
    margin-bottom: 15px;
}

.copy-modal {
    max-width: 380px;
    padding: 30px;
}

.copy-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(180deg, var(--mc-green) 0%, var(--mc-dark-green) 100%);
    border: 4px solid var(--mc-dark-green);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--mc-white);
    margin: 0 auto 15px;
    text-shadow: 2px 2px 0 #000;
    box-shadow: 
        inset 2px 2px 0 #8FC,
        inset -2px -2px 0 #2A4A1A;
}

.sponsor-modal {
    max-width: 350px;
}

.sponsor-qr {
    width: 250px;
    height: auto;
    border: 3px solid #333;
    margin: 15px auto;
    display: block;
}

.sponsor-modal p {
    color: var(--mc-gray);
    font-size: 16px;
    text-shadow: 1px 1px 0 #000;
}

.terms-modal {
    max-width: 500px;
    text-align: left;
}

.terms-content {
    max-height: 300px;
    overflow-y: auto;
}

.terms-content p {
    color: var(--mc-gray);
    font-size: 15px;
    margin: 10px 0;
    text-shadow: 1px 1px 0 #000;
    line-height: 1.6;
}

.sponsor-divider {
    display: flex;
    align-items: center;
    margin: 15px 0;
}

.sponsor-divider::before,
.sponsor-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: #333;
}

.sponsor-divider span {
    padding: 0 15px;
    color: var(--mc-gray);
    font-size: 14px;
}

.terms-sponsor {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 2px solid #333;
    text-align: center;
}

.sponsor-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(180deg, #12B7F5 0%, #0A8CD0 100%);
    border: 3px solid #086B9E;
    color: var(--mc-white);
    padding: 12px 25px;
    font-size: 16px;
    text-decoration: none;
    text-shadow: 1px 1px 0 #000;
    box-shadow: 
        inset 1px 1px 0 rgba(255,255,255,0.3),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        3px 3px 0 rgba(0,0,0,0.3);
    transition: all 0.2s;
}

.sponsor-btn:hover {
    background: linear-gradient(180deg, #2BC4F7 0%, #12B7F5 100%);
    transform: translateY(-2px);
}

.sponsor-icon-btn {
    height: 22px;
    width: auto;
}

.sponsor-message {
    color: var(--mc-gray);
    font-size: 15px;
    text-shadow: 1px 1px 0 #000;
    margin-bottom: 15px;
    line-height: 1.5;
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
    .editor-container {
        grid-template-columns: 1fr;
    }
    
    .convert-action {
        justify-content: center;
        padding: 15px 0;
    }
    
    .convert-btn {
        flex-direction: row;
        padding: 15px 40px;
    }
}

@media (max-width: 768px) {
    .logo-text {
        font-size: 32px;
    }
    
    .back-link {
        position: static;
        display: block;
        text-align: left;
        margin-bottom: 10px;
    }
    
    .qq-group-btn {
        top: auto;
        bottom: 15px;
        right: 15px;
    }
    
    .convert-options {
        flex-direction: column;
        gap: 15px;
    }
    
    .format-select {
        min-width: 100%;
    }
    
    .swap-btn {
        transform: rotate(90deg);
    }
    
    .swap-btn:hover {
        transform: rotate(270deg);
    }
}